Antistatic agent

Abstract

An agent suitable for imparting antistatic properties to plastics is disclosed. The incorporation of small amounts of perfluoroalkylsulfonic acid salt in plastic resins, notably thermoplastic resins was found to be effective for this purpose.

1. A light transmitting thermoplastic molding composition comprising
 (i) (co)polycarbonate resin,  
 (ii) a sufficient amount of an antistatic salt to render the composition antistatic, wherein the salt conforms to 
   RA—SO 3  X  
 
 
       wherein R denotes perfluorinated linear or branched carbon chain having 1 to 30 carbon atoms, A denotes a direct bond or an aromatic nucleus, and X denotes an alkylated and/or arylated member selected from the group consisting of ammonium ion NR′R″R′″R″″, sulfonium ion SR′R″R′″R″″, imidazolinium ion and tropylium ion wherein R′, R″, R′″ and R″″independently one of the others denote halogenated or non halogenated, linear or branched carbon chains having 1 to 30 carbon atoms or a C 1-4 -(alkyl)aromatic radical. 
     
     
       2. The molding composition of  claim 1  wherein the salt is at least one member selected from the group consisting of perfluorooctanesulfonic acid tetraethylammonium salt, perfluorobutanesulfonic acid tetraethylammonium salt, perfluorooctanesulfonic acid benzyltrimethylammonium salt, perfluorobutanesulfonic acid benzyltrimethylammonium salt, perfluorooctanesulfonic acid trimethylphenylammonium salt, perfluorobutanesulfonic acid trimethylphenylammonium salt, perfluorobutanesulfonic acid dimethyldiphenylammonium salt, perfluorooctanesulfonic acid dimethyldiphenylammonium salt, perfluorobutanesulfonic acid trimethylneopentylammonium salt, perfluorooctanesulfonic acid trimethylneopentylammonium salt, perfluorobutanesulfonic acid dimethyldineopentylammonium salt and perfluorooctanesulfonic acid dimethyldineopentylammonium salt. 
     
     
       3. The molding composition of  claim 1  wherein the amount is 0.01 to 2 percent relative to the weight of the composition. 
     
     
       4. The molding composition of  claim 1  wherein the salt is perfluoro-octanesulfonic acid tetraethylammonium. 
     
     
       5. A molded article comprising the molding composition of  claim 1 .